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I don't have my Sears inventory sheets handy, but that used to be a semi common spark plug size. It was fairly often used by Ford. I don't see your location posted below your avatar, so I don't know if you are in a metropolitan area or in the sticks. Industrial supply stores are another source.
From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by CFI-EFI
I don't have my Sears inventory sheets handy, but that used to be a semi common spark plug size. It was fairly often used by Ford. I don't see your location posted below your avatar, so I don't know if you are in a metropolitan area or in the sticks. Industrial supply stores are another source.
RACE ON!!!
That's what it is. Most spark plugs are 14 mm these days but 18 mm used to be very common and that's what the C4s O2s are..